His remarkable works include Arnor de Perdirao, Amor de Salvarao, Retrato de Ricardina, and the series entitled Novellas do Minho; moreover some of his essays in history and literary criticism, such as Bohemia do Espirito, rank only next to his romances.
The land frontiers are to some extent defined by the course of the four principal rivers, the Minho and Douro in the north, the Tagus and Guadiana in the south; elsewhere, and especially in the north, they are marked by moun- Proetie P Y ?
The only deep indentations of the Portuguese littoral are the lagoon of Aveiro and the estuaries of the Minho, Douro, Mondego, Tagus, Sado and Guadiana, in which are the principal harbours.
Three so-called Portuguese systems are sometimes distinguished: (1) the Transmontane, stretching between the Douro and the Minho; (2) the Beirene, between the Douro and the Tagus; (3) the Transtagine, south of the Tagus.
The following ranges belong to the Transmontane system, which is the southern extension of the mountains of Galicia: Peneda (4728 ft.), forming the watershed between the river Lima and the lower Minho; the Serra do Gerez (4817 ft.), which rises like a gigantic wall between the Lima and the Homem, and sends off a spur known as the Amarella, Oural and Nora, south-westward between the Homem and the Cavado; La Raya Seca, a continuation of Gerez, which culminates in Larouco (4390 ft.) and contains the sources of the Cavado; Cabreira (4196 ft.), which contains the sources of the river Ave and separates the basin of the Tamega from that of the Cavado; Marao (4642 ft.), Villarelho (3547 ft.) and Padrella (3763 ft.), forming together a large massif between the rivers Tamega, Tua and Douro; and Nogueira (4331 ft.) and Bornes (3944 ft.), which divide the valley of the Tua from that of the Sabor.